What is Dropshipping?

Rotor Sail explained

Rotor Sail is a rotating cylinder attached to the ships deck When the wind is favorable, the rotational speed of the sail is accelerated The spinning cylinder meets the wind differently on different sides of the cylinder The flow is accelerated on one side and decelerated on the other This generates a pressure difference that pushes the ship forward With the technology its possible to gain significant fuel savings on commercial ships For more info, visit www.norsepower.com

Reader Comments

  1. Why is the low pressureside on the side were the most air is redirected towards and the high pressure side were the least air is?

  2. You have to use an awful big electric motor to spin those and where do they get the power, solar panels? I think not. They get it from the diesel engines powering the ship. What's so green about that? I'm skeptical!

  3. Why the need for the rotating cylinder instead of a small solid sail? I'm sure you've done the simulations, so your rotating cylinder likely works better, but intuitively I would think an aerofoil (as on an aeroplane, but sticking upwards instead of sideways) would work better, particularly since it's using perpendicular wind.

  4. Question, is this more efficient than using a Vertical axis wind turbine such as the helical Darrieus turbine to directly provide power to the engine and if so. Why?

    In addition to this, could ships not also tow a long, light bouyant Surface attenuator in their wake to recoup energy lost through drag, or would there be a net energy loss due to the attenuators' own drag energy costs?

  5. If we had a large sailing schooner similar to the ones used on the trade routes of the nineteenth and early twentieth centuries could we replace all of those sails with rotor sails to create a rotor schooner with the primary propulsion being the rotors? Would that schooner still require a large keel to reduce sideways ship movement by the wind? Finally if the wind speed dies down can this potential loss in lift be compensated by increasing the rotor speed and if so could the lift force remain constant by a varying the rotor speeds automatically?

  6. silly. why not just use a retracting sail instead? would be far more beneficial in that it would be more efficient and when there is wind in the opposite direction will not have drag after retracting.

  7. So if the wind is blowing front to back or back to front then the lift would be perpendicular to the direction of travel. So what's the point of this?

  8. So, when the wind is not perpendicular to direction of travel, the effect is lessened to a degree, but thrust is used and maintained by force of the hull and rudder redirecting the energy forward. Same as sailing.

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